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本文根据几年来稻瘟病菌生理小种测定结果,初步探明了小种动态与品种抗瘟性之间的关系。198年前,我省主栽水稻汕优二号,田间受害率很高,是以 ZB 群小种占优势。1986年换汕优二号等感病品种后,小种组成开始趋向多样化,年际间小种出现频率亦相应发生变化,致病力强的 ZA 群小神逐年上升,ZC群小种增殖速度较快,ZB 群小种逐年递减。在防治上应针对当地存在的小种类群及其品种的致病力强弱,做好良种的合理搭配和有计划的轮换种植,以充分发挥现有抗病良种的增产作用。
Based on the results of physiological races of Magnaporthe grisea in the past few years, the relationship between races dynamics and variety blast resistance has been preliminarily proved. 198 years ago, the main rice Shanyou 2 in our province, the field suffered a high rate of damage, is based on ZB races dominance. After exchanging Shanyou 2 and other susceptible varieties in 1986, the races of the races began to diversify, and the races of races also changed correspondingly. The small virulence of ZA group with strong virulence increased year by year, Faster, ZB races declining year by year. In the prevention and control should focus on the local existence of small groups and their varieties of virulence, good varieties and good rotation with a planned rotation, in order to give full play to the existing yield-resistant varieties.